Wencel brown



(No Model.) I W. BROWN.

SEWING MACHINE SHUTTLE No. 278,303. Patented May ZZ, 1883.

, minesses:

Attemey.

1 downward on said screw, whereby the adjust- To all whom it may concern:

- i 1 UNIT-ED- STATES PATENT OFFICE.

"wENoEn BRO N, .OFMILWAUKEE, WISCONSIN, ASSIGNOR OFONE-HALF To JAMES B. ERWIN, or. SAME PLACE.

SEWING-MACHINE SHUTTLE.

SPECIFICATION forming part Letters Patent No. 278,303, dated May 22, 1883. r

' Application filed April 27,1882. (No model.)

Be it known that I, WENCEL BROWN, a citizen of the United States, residing at Milwau- 1 ykee, in the countyof Milwaukee and State of Wisconsin, have invented certain new and use- .ful Improvements in Sewing-Machine Shutties; and I do-hereby declare theifollowing to be a full, clear, and exact description of the invention, such as will enable others skilled in thesame, reference being bad to the accompanying drawings, and to letters or figures of refthe art to which it appertains to make and use erence marked thereon, which form a part of I. this specification.

Myinvention relatesto improvementsin sew- I ing-machineshuttles, and pertains, first, to the device for regulating the tension of the thread asit is drawn from the-shuttle second, to the construction of the device by which the rear end of the tension-spring is attached to the heel of the shuttle-case.

The construction and operation of my im-- a proved shuttle are further explained by refer ence to the accompanying drawings,in which- Figure 1 represents a perspective view of a shuttle embodying my improvements. Fig. 2

is an end view. Fig. 3 is a side view, and 1 Fig. 4 is a longitudinal section.

Like parts are represented by the same retference-letters throughout the several views.

A is the shuttle-case. B is the bobbin. (3

represents the thread. D is the tension-sprin i The spring 1). serves the twofold purpose of retaining the bobbin in the shuttle and producin g the required tension of the thread. The

front end of p the spring D is attached to the case by an adjusting-screw, E, upon which the spring is free to be turned at an angle to the r case when inserting and withdrawing the bob- .4 a spiral spring, a, which presses upward against bin. The screw E is surrounded by a small the lower side of the tension-spring D, and retains said tension-spring against the head of T I said screw E,"therebypreventing the tensionspring fromwibrating loosely upward and inent of the tension-spring may be made more :positive and amore uniform tension attained.

t g 1 dis a recess for the reception of the spring a.

X T5 lfyided with a semicircular disk, I), wh ich en- Therear endof the tension-spring D, is progages in the rear end of the case and retains the bobbin therein, while it also retains the center of the spring D in close contact with the center of the case upon-the thread, as shown, whereby the tension of the thread is produced.

The opening at the lower edge of the disk 1),

between the case and the edge of the disk I), is provided that the operator may insert his finger beneath theedge of the disk and thereby disengage the same from the end of the case, which object is accomplished by springing the lower edgeofthe disk outward slightly. The spring being thus disengaged, it is readily turned to one side, when the bobbin maybe inserted or withdrawn. s

I am aware that a circular disk has previously been attached to the tension-spring, which entirely closed the end of the shuttle case, no provision being made for inserting a persons -finger. bctween the edge of the disk and the shuttle-case, as shown by Patent No. 152,041.

It is obvious that in my device by forming the disk and tension-spring of the same piece of elastic metal, the disk being semicircular in shape, and space being provided beneath the lower edge of said disk for the operator to insert his finger, he may, owing to the elasticity of the tension-sprin g, spring said disk outward, and thus disengage it from the shuttle-case without mechanical appliances.

' I am also aware that the end of a sh uttle-case has been partially closed by a disk pivoted to the end of the case upon a horizontally-arranged pin, around which it is adapted to revolve in a Vertical plane when opening said case, said disk having no connection with the tension-spring, the same being shown in Patout No. 220,816.

d is anopening formed through the shuttlecase directly over the inner end of the bobbin, through which lint from the thread or other ref use matter maybe observed and removed. The thread is drawn from the case through a short opening, H, by which it is confined in its escape to the center of the shuttle-case beneath the center of the tension-spring, at which point it receives a uniform pressure from said spring, whereby a uniform tension is produced. The thread is drawn into the opening H through the longitudinal slot I and transverse slot J ICO G is a bead or elevation formed around the opening H, over which the thread passes as it is drawn from the bobbin, and whereby it is retainedin contact with and receives its tension from the central part only of the tensionspring. Itis obvious that the elevation G supports the center of the tension-spring above the body ofthe case, leaving a space between the-case and spring upon the respective sides of the elevation, through which the thread may pass freely without its tension being affected, while it is obvious that without such elevation the tension will necessarily be varied as the thread is drawn toward and from the center between the center and the respective ends of the tension-spring, the tension of said spring being uniform at a given point only. lhe front end of the spring D, when inits normal position,is retained at a slight distance from the case, and may be drawn downward by turning forward the screw E; or it may, by an inverse movement of the screw, be thrown upward by the action of the spiral .spring (0, whereby the center of the sprin g is caused to bear more heavily or lightly upon the thread, thereby increasing ordiminishing the tension, as required.

Having thus described my invention, what I claim'as new, and desire to secure by Letters Patent, is i erases the thread above said central opening, by which opening the thread is confined to the center of said spring,.substantial1y as and-for the purpose specified.

- 2. A shuttle-case for sewing-machines, having its central opening or thread-passage provided with an elevation or head which surrounds said thread-passage, and forms a bearing over which the thread is drawn in contact with the tension-spring, and whereby the tension of the thread is confined to the center of said tension-spring, substantially as and for the purpose specified.

3. The shuttle-case A, provided with open slot I, transverse slot J, and thread-passage H, provided with the elevation G, in combination with-the spring D, provided with semicircular disk I), substantially as set forth.

4. 'In a cylindrical shuttle-case, A, the opening 01, formed above the innerend of the bobbin, adapted to'facilitatethe cleaning of the case, as set forth.

In testimony whereof I affix my signature 1n presence of two witnesses.

VVENGEL BROWN.

Witnesses:

JAs.-B.ERWIN, F. H. WEST. 

